Long-Range Coherence and Multiple Steady States in a Lossy Qubit Array

Shovan Dutta and Nigel R. Cooper
Phys. Rev. Lett. 125, 240404 – Published 9 December 2020
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Abstract

We show that a simple experimental setting of a locally pumped and lossy array of two-level quantum systems can stabilize states with strong long-range coherence. Indeed, by explicit analytic construction, we show there is an extensive set of steady-state density operators, from minimally to maximally entangled, despite this being an interacting open many-body problem. Such nonequilibrium steady states arise from a hidden symmetry that stabilizes Bell pairs over arbitrarily long distances, with unique experimental signatures. We demonstrate a protocol by which one can selectively prepare these states using dissipation. Our findings are accessible in present-day experiments.

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  • Received 16 April 2020
  • Accepted 11 November 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.240404

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & ThermodynamicsQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Shovan Dutta* and Nigel R. Cooper

  • T. C. M. Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom

  • *sd843@cam.ac.uk
  • nrc25@cam.ac.uk

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Issue

Vol. 125, Iss. 24 — 11 December 2020

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